Dial-protractor.



A. LELOUP.

I DIAL PEOTRAGTOR. AIPPLIOATION FILED AUG. 30, 1910.

1,060,466. Patented Apr. 29, 1913.

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Specification of Letters Patent.

application filfld August 30,.1Q10. aerial NQLEYBJ'Bz- To all whom z'tmay concern Be it known that I, Auous'rr. 'Ln-LoUP, a cit1zen of theFrench Republic, and resident of Langres, France, have invented certainnew and useful Improvements in D1al-Pro-' a toothed gearing contained ina box which is made integral with one of the arms of the bevelprotractor. The other arm ofthe latter when vmoved actuates the gearwheels through the instrumentality of the pivot and the angles may beread on dials'carried by certain gear wheels and which move in front ofwindows provided in the cover of the box.

The apparatus is utilized absolutely in the same manner as an ordinarybevel protractor, one of the branches or arms of the latter being heldin contact with One ofthe sides ofthe angle to be measured while theother arm is rotated around the fulcrum or hinge of the two arms untilit applies itself to the second side of the. angle. The apparatusbesides may be provided with a Water level of a special constructionallowing to determine any desired position with reference to thehorizontal or vertical direction.

The accompanying drawing given by way of example, shows one form ofembodiment of adial protractor which forms the subject matter of thisinvention, and in this drawing: Figure l is an elevation view of theapparatus. Fig. '2 is a top plan View of same. Fig. 3 is an elevationview with a partial section. Figs. 4 and 5 are detail views drawn at asomewhat enlargedscale showing the working of the water level? As shownin the drawings, the apparatus comprises 'a bevel protractor composed oftwo arms a, b hingedly connected together at one of their ends. Securedto the arm a is a box 0, which is provided with windows (1, e (Fig. 1)behind which movable dials 9,7, 2' appear which allow to read indegrees, minutes and seconds the angle formed by the arms a and b. Thedials g, i are a tuated in the manner shown by Fig. 3. Thearms a and bare hingedly connected together by means of a tube or pivot memberratenteda r. 29,1913:

j which is secured thrbugh the medium of a crown and of screws on thearm b and rotates freely in the two branches of the arm or body a toboth sides of which it is heldby any desirable means. This tube 7'carriesv for instance by means of a pin penetrating into a groove (notshown) a second tube 7:: on which a toothed wheel I is mounted. Thistoothed wheel may be secured by means of a cotter pin, for instance on apivot P, which is made integral with a disk or cap brazed 0 meshes witha pitiion 77 mounted on a shaft g-carrying on the other side a toothedwheel 0' which is made integral with the movable dial it. The wheel i'meshes with a pinion-s carried by a shaft t which carries on the otherside a toothed wheel u which meshes witha pinion '0 which is mounted aswell as the movable dial 5 on a shaft w. The shafts n, g, t, w, arerotatably mounted as well as the shaft k into the box or casing c. It isclear that the toothed wheels and pinions cited above must be gearedwith reference to each other in a certain ratio which varies accordingto the degree of sensibility which it is desired to give the apparatus.If one'admits for instance that the movable dial 9 were to show thedegrees, the dial it the minutes and the dial a the seconds, eachsubdivision of the dial 9 corresponding to one de 72. or o the dial irespectively to 6 minutes or to six seconds, it would be possible togive to the toothed wheels the following cc and each subdivision of thedial numbers of teeth: Wheel Z, teeth. Pin-' ion m, 50 teeth. Wheel 0,100 teeth. Pinion p, 10 teeth. Wheel 7', 100 teeth. Pinion s, 10 teeth.Wheel u, 36 teeth. Pinion c; 6 teeth. It is needless to say that onemight choose as well other numbers of teeth giving the same result. 7

The dial showing the seconds and even that showing the minutes might bedispensed with, the apparatus then indicating only respectively thedegrees and the minutes or only the degrees and being simplified in acorresponding .manner.

One of the arms of the apparatus for instance the arm may receive awater. level'l (Figs. 4 and 5 which is formed of a glass tube bent inelongated shape and closed on fashion used in apparatuses of this kind.

When it is desired to measure an angle' with reference to the verticaldirection (l ig. 4) the arm I) is applied against the object theposition of which has to be determined, the level w w then indicates onthe scales 2 and 2 which are graduated in opposite directions, the anglecomprised between the arm 6 and the vertical line. When it is desired todetermine the position of a memher with reference to the horizontalline, the function is absolutely the same and the corresponding angle isindicated by the level g -y of the same liquidmass by meansof the scales3*, 3 which are also graduated in opposite directions.

Having now fully described my said invention, what I claim and desire tosecure by Letters Patent is:

A bevel protractor comprising a body composed of spaced plates, an armmovable into the space between said lates when in inoperative position,a who ar pivot connecting said arm to the body, a casing seof gearsrotatably mounted Within the easing aforesaid, dials secured to thegearing, the casing having sight openings above said dials topermitreading of the latter therethrough, and a controlling gear secured tothe end of the pivot projecting into the casing, said gear being adaptedto operate the train of gearing aforesaid upon movement of the arm, anda spirit level mounted in the arm and adapted to be received between thesides of the body when inan inoperative position.

, In testimony whereof I have hereunto set my hand in presence of twowitnesses,

AUGUTEJLELOUP.

Witnesses:

I O. H. OLIV E E. TURANE.

